Catheter Introducer

ABSTRACT

The invention relates to a catheter introducer comprising: a tube-like introducer sheath; an introducer hub having a distal section and a proximal section, wherein the distal section is joined to the proximal end of the introducer sheath and the proximal section defines a chamber; a needle extending through the introducer hub and the introducer sheath and having opposite proximal and distal ends, the distal end forming a needle tip; a needle hub attached to the proximal end of the needle; a needle safety device slidably arranged on the needle, wherein the needle safety device is retained in the chamber of the introducer hub when the needle extends through the introducer hub and the introducer sheath, and removable from the introducer hub once the needle tip is received in the needle safety device upon withdrawal of the needle from the introducer sheath.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to India Application No. 1293/DEL/2008,filed May 28, 2008, the disclosure of which is incorporated herein byreference.

The present invention relates to a catheter introducer, in particular anover-the-needle peel-away catheter introducer, comprising a tube-likeintroducer sheath; an introducer hub having a distal section and aproximal section, wherein the distal section is joined to a proximal endof the introducer sheath and the proximal section defines a chamber; aneedle extending through the introducer hub and the introducer sheathand having opposite proximal and distal ends, wherein the distal endforms a needle tip; and a needle hub attached to the proximal end of theneedle.

As used herein, the term proximal refers to a location on the deviceclosest to, for example, a clinician using the device. Conversely, theterm distal refers to a location on the device farthest from theclinician, such as the distal needle tip to be inserted into a patient'svein.

A catheter introducer of the above kind is generally known and typicallyused to facilitate insertion and placement of a catheter or anothermedical device into a patients vasculature. A conventional peel-awaycatheter introducer, which is also referred to as a peelable orsplittable or a tear-away catheter introducer comprises a pair of wingsextending transversely from the introducer hub.

When using the peel-away catheter introducer a clinician grabs theneedle hub along with the introducer hub and inserts the distal portionsof the needle and of the introducer sheath at a selected site into apatient's skin. The clinician advances the device until venipuncture hasbeen confirmed, for example, when blood enters a flashback chamberformed in the needle hub. After venipuncture has been confirmed, theclinician advances the distal end portion of the introducer sheath intothe patient's vein and withdraws the needle. With the catheterintroducer properly placed, the clinician can then insert a medicaldevice, such as a catheter, into the proximal opening of the introducersheath and advance the medical device through the introducer sheathuntil it is properly placed in the patient's vasculature. Afterplacement of the medical device the clinician withdraws the introducersheath out of the venipuncture site. The clinician then splits theintroducer hub and introducer sheath into two respective separate halvesby a combination of twisting and/or pulling apart of the wings alongtear lines provided in the introducer hub and introducer sheath untilthe two halves of the introducer hub and introducer sheath split apart.The clinician can thus remove the introducer hub and introducer sheathwhile the catheter inserted into the patient's vein remains in place.

Due to the increasing incidence of blood born pathogens such as humanimmunodeficiency virus (HIV), hepatitis B virus (HBV) and hepatitis Cvirus (HCV) there is a need to protect clinicians or other medicalprofessionals or personnel handling catheter introducers from accidentalcontact with the sharp needle tip after withdrawal of the needle fromthe introducer sheath and introducer hub.

It is an object of the invention to provide a catheter introducer whichprovides reliable protection against accidental pricking by the needleonce the needle has been withdrawn from the introducer sheath andintroducer hub.

This object is satisfied by a catheter introducer having the features ofclaim 1.

The catheter introducer of the invention comprises a tube-likeintroducer sheath; an introducer hub having a distal section and aproximal section, wherein the distal section is joined to a proximal endof the introducer sheath and the proximal section defines a chamber; aneedle extending through the introducer hub and the introducer sheathand having opposite proximal and distal ends, wherein the distal endforms a needle tip; a needle hub attached to the proximal end of theneedle; and a needle safety device slidably arranged on the needle,wherein the needle safety device is retained in the chamber of theintroducer hub when the needle extends through the introducer hub andthe introducer sheath and removable from the introducer hub once theneedle tip is received in the needle safety device upon withdrawal ofthe needle from the introducer sheath.

The needle safety device is operative as a guard for the needle tip byautomatically covering the needle tip during withdrawal of the needlefrom a patient and subsequently from the introducer sheath. The needlesafety device thereby serves to prevent accidental pricking of, forexample, a clinician by the needle tip after removal of the needle fromthe introducer sheath. Hence, the needle can be safely disposed of afteruse.

According to an embodiment, a part of the needle safety device is, seenin a radial direction, arranged between the introducer hub and theneedle hub. In this way, a not only a safe seat of the needle safetydevice in the chamber of the introducer hub but also a secure connectionbetween the introducer hub and the needle hub are achieved prior towithdrawal of the needle from the introducer sheath. Furthermore, thearrangement of a part of the needle safety device between the introducerhub and the needle hub facilitates a correct positioning of the needlesafety device in the introducer hub and thus makes the assembly undultimately the manufacture of the catheter introducer easier and lessexpensive.

According to a further embodiment, the needle safety device comprisestwo generally L-shaped extensions formed on opposite sides of the needlesafety device, preferably in the region of a proximal end thereof. EachL-shaped extension may have an axial section extending generally in anaxial direction at a distance from a base portion or a reinforced jawportion of the needle safety device. As used herein, the axial directionis defined by the longitudinal axis of the introducer sheath and of theneedle extending therethrough.

Preferably, the proximal section of the introducer hub is configured tobe received between the axial sections and the base portion or thereinforced jaw portions of the needle safety device.

According to a further embodiment, the proximal section of theintroducer hub is formed from two opposite proximal tube sectionsextending in the axial direction. Similarly, the needle hub may comprisea main body and two opposite tube sections extending in the axialdirection from a distal end of the main body.

Preferably, the tube sections of the needle hub are configured to engagebetween the proximal tube sections of the introducer hub such that thetube sections of the needle hub and the proximal tube sections of theintroducer hub together form a substantially closed tube. Because ofthis substantially closed tube the chamber defined by the proximalsection of the introducer hub is also substantially closed, such thatthe needle safety device received in the chamber is protected fromoutside influences. This helps to permanently maintain a reliablefunctioning of the needle safety device.

According to a further embodiment, the main body of the needle hubcomprises a tube-like portion configured to receive both a base portionof the needle safety device and a portion of the proximal section of theintroducer hub. In the assembled state, i.e. prior to withdrawal of theneedle, the tube-like portion of the main body of the needle hub hencesurrounds a part of the needle safety device as well as a part of theproximal section of the introducer hub, thereby not only protecting theneedle safety device but also preventing the introducer hub andconsequently the introducer sheath from accidentally splitting inhalves.

According to a further embodiment, locking means are provided to holdthe portion of the proximal section of the introducer hub in placebetween the axial sections and the base portion or the reinforced jawportions of the needle safety device. The locking means help to securethe needle safety device at the introducer hub as long as the needle hasnot been fully withdrawn from the introducer sheath and the needle tiphas not been received in the needle safety device. Hence, the needle canmove relative to the needle safety device until the needle tip is safelyreceived in the needle safety device. The locking means thus ensure acorrect functioning of the needle safety device.

According to a further embodiment, locking means are provided to holdthe proximal section of the introducer hub in place in the tube-likeportion of the needle hub. The locking means ensure a safe connectionbetween the introducer hub and needle hub and thereby prevent the needlefrom being accidentally withdrawn from the introducer sheath.

Preferably, both the locking means operating between the introducer huband the needle safety device and the locking means operating between theintroducer hub and the needle hub comprise a locking protrusion on therespective one part and a corresponding locking depression in therespective other part. For instance, respective locking protrusions maybe provided in the region of the proximal ends of the proximal tubesections of the introducer hub, whereas corresponding grooves may beprovided at the inner side of the tube-like portion of the needle huband of the generally L-shaped extensions of the needle safety device.

The needle safety device may comprise first and second jaws extendingfrom the base portion in a generally axial direction.

According to one embodiment, the first jaw is integrally formed with thebase portion and, preferably, substantially rigid. Due to the first jawbeing formed integrally with the base portion, the number of parts inthe needle safety device is reduced and the simplicity thereofincreased. Forming the base portion, and thus preferably also the firstjaw, from a plastic material helps to reduce the costs of manufacturingthe needle safety device. The first jaw being substantially rigidincreases the integrity of the needle safety device. At the same time, areliable functioning of the needle safety device can be ensured by asuitable deflectability of the second jaw.

The second jaw may include a strip of material having spring-likeproperties, for example a strip of sheet metal or a strip of a suitableplastic material. Because of the first and second jaws being made fromtwo separate parts, the needle safety device can easily be adapted toneedles of different thicknesses. Furthermore, due to its simple designthe needle safety device and, thus, the entire catheter introducer canbe manufactured at low cost. Due to its spring-like properties thesecond jaw may be deflected against a restoring force by the needleextending all the way through the needle safety device, such that thesecond jaw snaps in front of the needle tip as soon as the needle tip ismoved inbetween the two jaws, thereby safely guarding the needle tip.

According to an alternative embodiment that can also be manufactured atlow cost, the first and second jaws may be formed integrally with thebase portion, wherein preferably both jaws have spring-like properties.

The second jaw may have a distal end section which extends towards thefirst jaw such that it sits on the needle when the needle extendsthrough the needle safety device, thereby deflecting the second jawoutwardly against a restoring force, and blocks the needle tip fromprotruding from the needle safety device when the needle tip is receivedbetween the jaws, thereby safely guarding the needle tip in the needlesafety device.

According to a further embodiment an elastic element, in particular atension ring, surrounds the first and second jaws in order to positivelycollapse the jaws when the needle tip is received between the jaws.Preferably, the elastic element and the jaws are configured such thatthe second jaw can be spread away from the first jaw against a restoringforce of the elastic element in order to allow the needle to extend allthe way through the needle safety device.

Due to the elastic element exerting its restoring force on the secondjaw in the deflected state of the second jaw, which is the state inwhich the catheter introducer is typically shelved prior to use, theelastic element ensures that the spread apart jaws will snap togetherand guard the needle tip upon withdrawal of the needle from theintroducer sheath even after a longer shelf time, thereby continuouslyensuring a correct functioning of the needle safety device. In addition,the elastic element prevents the jaws from becoming loose when theneedle safety device slides along the needle, thereby further adding toa correct functioning of the needle safety device. Furthermore, theelastic element helps prevent the needle tip from protruding sidewaysout of the needle safety device, thereby further increasing theprotective function of the needle safety device.

According to a further embodiment the needle extends through an axialbore in the base portion of the needle safety device, wherein the crosssection of the bore is adapted to the main profile of the needle, andthe needle has an enlargement near the needle tip rendering the outerdiameter of the needle, seen in at least one direction, greater than thediameter of the bore. The enlargement prevents the needle safety devicefrom sliding off the needle when the needle tip is received between thejaws, thereby even further improving the protective function of theneedle safety device.

Further subject matter of the invention is a needle safety device forguarding the tip of a needle of a medical apparatus, for example, acatheter introducer of the above described type or an intravenouscatheter apparatus, which comprises a base portion and two jawsextending therefrom and defining an axial direction and two generallyL-shaped extensions formed on opposite sides of the needle safetydevice, wherein each L-shaped extension has an axial section extendinggenerally in the axial direction at a distance from the base portion orfrom reinforced portions of the jaws (claim 20). Apart from that, theneedle safety device may be configured similar to the needle safetydevice of the above described catheter introducer.

Preferred embodiments of the invention are described in the followingdescription and in the accompanying drawings, wherein:

FIG. 1 a to 1 c show (a) a first longitudinal sectional view of acatheter introducer according to the invention, (b) a secondlongitudinal sectional view of the catheter introducer, and (c) anenlargement of a portion of FIG. 1 a;

FIGS. 2 a and 2 b show perspective views of an introducer hub of thecatheter introducer of FIG. 1 and of the introducer hub attached to anintroducer sheath;

FIGS. 3 a and 3 b show (a) a perspective view of a needle hub of thecatheter introducer of FIG. 1 and (b) a side view of the needle hubattached to a needle;

FIG. 4 a to 4 f show (a) a perspective view of a needle safety device ofthe catheter introducer of FIG. 1, (b) a longitudinal sectional view ofthe needle safety device, (c) a side view of the needle safety device,(d) a plan view of the needle safety device, (e) a side view of theneedle safety device guarding the tip of a needle, and (f) alongitudinal sectional view of the needle safety device guarding theneedle tip; and

FIG. 5 a to 5 f show (a) a perspective view, (b) a side view, (c) alongitudinal sectional view, and (d) a plan view of an alternativeneedle safety device for the catheter introducer of FIG. 1, and (e) aside view and (f) a longitudinal sectional view of the needle safetydevice guarding the tip of a needle.

FIGS. 1 a and 1 b show longitudinal sectional views of anover-the-needle peel-away catheter introducer of the invention. Thecatheter introducer comprises a tube-like introducer sheath 10 having aproximal end region 12 that is joined to an introducer hub 14.

Furthermore, the catheter introducer comprises a needle 16 having adistal end that forms a needle tip 18 and a proximal end that isattached to a needle hub 20.

Prior to use of the catheter introducer, the needle hub 20 is connectedto the introducer hub 14 such that the needle 16 extends all the waythrough the introducer hub 14 and the introducer sheath 10 and theneedle tip 18 protrudes beyond a distal end of the introducer sheath 10.

In order to prevent accidental pricking by the needle tip 18 prior touse of the catheter introducer, an elongate cap 22 or protective tube ismounted to the introducer hub 14, which covers the length of theintroducer sheath 10 and also the needle tip 18 protruding therefrom.

As can be taken in more detail from FIG. 2, the introducer hub 14includes a distal section 24 and a proximal section 26. The distalsection 24 has smaller inner and outer diameters than the proximalsection 26 and is joined to the proximal end region 12 of the introducersheath 10.

In the transition region between the distal section 24 and the proximalsection 26 a funnel-like structure 28 is formed in the introducer hub14, which helps to facilitate the introducing of a medical device, forexample a catheter, into the introducer sheath 10 after the introducersheath 10 has been inserted into the vein of a patient. Furthermore, twowings 30 extend transversely from the introducer hub 14 in thetransition region between the distal section 24 and the proximal section26.

Both the distal section 24 and the proximal section 26 of the introducerhub 14 are formed from pairs of opposite axially extending tube sections32, 34 which define first and second halves of the introducer hub 14.Prior to use, the first and second halves of the introducer hub 14 areconnected to each other by the funnel-like structure 28.

Once a medical device, such as a catheter, has been introduced throughthe introducer sheath 10 into a patient's vein, the person handling thecatheter introducer, for example a clinician, withdraws the introducersheath 10 from the venipuncture site. By a combination of twistingand/or pulling apart of the wings 30 the clinician then splits theintroducer hub 14 into its two separate halves, thereby also tearing theintroducer sheath 10, such that the introducer hub 14 and the introducersheath 10 can be removed from the catheter. In order to facilitate thebreaking of the introducer hub 14 into its two halves, tear lines 36 maybe provided in the funnel-like structure 28 and also in the introducersheath 10.

As can be seen in FIG. 3, the needle hub 16 comprises a main body 38 andtwo opposite tube sections 40 which extend in an axial direction from adistal end of the main body 38. The tube sections 40 of the needle hub20 are configured to engage between the proximal tube sections 34 of theintroducer hub 14 such that the proximal tube sections 34 of theintroducer hub 14 and the tube sections 40 of the needle hub 20 form asubstantially closed tube.

To this end, the tube sections 40 of the needle hub 20 and the proximaltube sections 34 of the introducer hub 14 have substantially the samelength and curvature, and the tube sections 40 of the needle hub 20 havea width corresponding to the gap between the proximal tube sections 34of the introducer hub 14.

Referring again to FIGS. 1 a and 1 b, the proximal tube sections 34 ofthe introducer hub 14 and the tube sections 40 of the needle hub 20together form a chamber 42 for a needle safety device 44 which isslidably arranged on the needle 16.

As shown in FIG. 4, the needle safety device 44 comprises a main part46, a clip 48 and a tension ring 50.

The main part 46 is made from a plastic material and comprises a baseportion 52 and an elongate portion 54 forming a first jaw 55. The baseportion 52 is of substantially cylindrical shape and has a bore 56extending therethrough in the axial direction for receiving the needle16.

The elongate portion 54 is of semi-cylindrical shape and extends fromthe base portion 52 in the axial direction. The elongate portion 52 hasa groove 58 formed in its flat side 60, which extends in the axialdirection along the entire length of the elongate portion 54 and formsan extension of the bore 56 in the base portion 52. While the bore 56has a generally circular cross section that is adapted to the main outerprofile of the needle 16, the groove 58 has a generally semi-circularcross section.

The clip 48 is formed from a strip of sheet metal having spring-likeproperties, such a steel or the like. Alternatively, the clip 48 couldbe formed from a plastic material which has suitable spring-likeproperties.

The clip 48 forms a second jaw 62 and comprises a base section 64 and adeflectable section 66. The base section 64 includes an axial sectionpart 68 and a radial section part 70. It is adapted to engage with thebase portion 52 of the main part 46 such that the axial section part 68lies against the outer surface of the base portion 52 while the radialsection part 70 lies against a rear or proximal end face of the baseportion 52, when the clip 48 is attached to the main part 46. In orderto ensure a correct positioning of the main part 46 and the clip 48, thebase portion 52 is provided with a guide 74 for the clip 48.

The clip 48 is secured to the main part 46 by means of a heat sealingconnection. To this end, the main part 46 initially has a pillar or pin76 formed at its proximal end face and extending generally in the axialdirection. The clip 48 has a corresponding opening 78 formed in itsradial section part 70 for receiving the pillar or pin 76 when the clip48 is mounted on the main part 46. Once the clip 48 has been broughtinto its correct position relative to the main part 46 the pillar or pin76 extending through the opening 78 of the clip 48 is deformed by heatand/or pressure in order to increase the diameter of the pillar or pin76. By making the diameter of the pillar or pin 76 larger than thediameter of the opening 78, the clip 48 is safely fixed at the main part46. Alternatively, the clip 48 could be secured to the main part 46 bymeans of gluing or welding or any other suitable type of connection.

The base section 64 of the clip 48 passes into the deflectable section66 via a step-like bending of the sheet metal strip. The deflectablesection 66 includes a straight section part 80 which is reinforced bytwo elongate wings 82 that extend on either side of the straight sectionpart 80 and are bent inwards, i.e. towards the elongate portion 54, byan angle of substantially 90°. In a relaxed state of the clip 48 mountedon the main part 46 (FIGS. 4 b and 4 c), the straight section part 80does not exactly extend in the axial direction, but is bent slightlytowards the elongate portion 54 of the main part 46.

In the region of its distal end, the straight section part 80 passesinto a head section part 84 which extends beyond the free end of theelongate portion 54 of the main part 46. The head section part 84 has agenerally V-like shape with the peak of the V pointing in the axialdirection and the free leg 86 of the V extending towards the elongateportion 54.

The tension ring 50 surrounds the elongate portion 54 of the main part46 and the straight section part 80 of the clip 48 in the region of theelongate wings 82. The tension ring 50 is made from a material havingelastic properties, for example rubber. The tension ring 50 isconfigured so that the deflectable section 66 of the clip 48 isdeflected against a restoring force of the tension ring 50, when theneedle 16 extends all the way through the needle safety device 44. Thissituation is called the deflected state of the needle safety device 44and is shown in FIG. 1 b.

When the needle 16 does not extend all the way through the needle safetydevice 44 (FIGS. 4 e and 4 f) or when there is no needle 16 at all(FIGS. 4 b and 4 c), the deflectable section 66 of the clip 48 is drawntowards the elongate portion 54 of the main part 46 by the tension ring50. In this situation, which is referred to as the collapsed state ofthe needle safety device 44, the head section part 84 of the clip 48overlaps with or extends over at least a portion of the distal end face90 of the elongate portion 54, thereby preventing the needle tip 18 fromprotruding out of the needle safety device 44 at the distal end thereof.

As has been mentioned above, the bore 56 provided in the base portion 52of the main part 46 of the needle safety device 44 is adapted to themain outer profile of the needle 16. As is indicated in FIG. 3 b, theneedle 16 is provided with an enlargement 92 near the needle tip 18,which renders the outer diameter of the needle 16, seen in at least onedirection, greater than the diameter of the bore 56. The enlargement 92prevents the needle safety device 44 from sliding off the needle 16 whenthe needle tip 18 is received between the first and second jaws 55, 62as is shown in FIGS. 4 e and 4 f.

As illustrated in FIGS. 4 a and 4 d, two generally L-shaped extensions94 are formed on opposite sides of the needle safety device 44 in theproximal region of the base portion 52 of the main part 46. EachL-shaped extension 94 has an axial section 96 which extends in the axialdirection at a distance from the base portion 52 of the needle safetydevice 44. The L-shaped extensions 94 are dimensioned such that proximalend portions 98 of the proximal tube sections 34 of the introducer hub14 are tightly received between the axial section 96 of the L-shapedextensions and the base portion 52 of the needle safety device 44 whenthe needle safety device 44 is received in the chamber 42 defined by thetube sections 34, 44 of the introducer hub 14 and the needle hub 20, asshown in FIGS. 1 a and 1 c.

In order to retain the proximal tube sections 34 of the introducer hub14 in engagement with the L-shaped extensions 94 of the needle safetydevice 44, locking grooves 100 are provided in the inner surfaces of theaxial sections 96 of the L-shaped extensions 94 and correspondinglocking protrusions 102 are provided at the outer surfaces of theproximal tube sections 34 of the introducer hub 14 (FIGS. 1 c and 2).

As is best seen in FIG. 3, the tube sections 40 of the needle hub 20pass into a tube-like portion 104 of the main body 38 of the needle hub20. The tube-like portion 104 is configured to receive not only the baseportion 52 of the needle safety device 44 but also a part of theproximal tube sections 34 of the introducer hub 14 (FIGS. 1 a and 1 c).

In order to secure the proximal tube sections 34 of the introducer hub14 in the tube-like portion 104 of the needle hub 20, locking grooves106 are provided in the inner surface of the tube-like portion 104 ofthe needle hub 20 (FIG. 3) and corresponding locking protrusions 108 areformed at the outer surface of the proximal tube sections 34 of theintroducer hub 14 in a distance distal from the locking protrusions 102provided for engagement with the needle safety device 44 (FIGS. 1 c and2).

The engagement of the locking protrusions 108 with the locking grooves106 prevent the needle hub 20 from being accidentally released from theintroducer hub 14.

At the same time, the locking engagement of the locking protrusions 102with the locking grooves 100 secure the needle safety device 44 at theintroducer hub 14, thereby preventing the needle safety device 44 frombeing accidentally withdrawn from the introducer hub 14 before theneedle tip 18 has been received between the first and second jaws 55, 62of the needle safety device 44.

FIG. 5 shows an alternative embodiment of a needle safety device 44.

Similar to the embodiment of FIG. 4 the needle safety device 44 shown inFIG. 5 comprises a main part 46 and a tension ring 50. However, incontrast to the embodiment of FIG. 4, the needle safety device 44 shownin FIG. 5 does not have any separate clip 48. Instead, the main part 46comprises a base portion 52 and two elongate portions 110, 112 thatextend from the base portion 52 generally in the axial direction to formthe first and second jaws 55, 62.

The base portion 52 and the two elongate portions 110, 112 areintegrally formed and made, for example, from a plastic material. Thebase portion 52 is of substantially cylindrical shape and has a bore 56extending therethrough in the axial direction for receiving the needle16. The bore 56 has a generally circular cross section that is adaptedto the main outer profile of the needle 16.

The elongate portions 110, 112 each have a proximal section 114 and adistal section 116. While the proximal sections 114 extend generallyparallel to each other, the distal sections 116 are inclined towardseach other in the collapsed state of the needle safety device 44 (FIGS.5 e and 5 f) or when no needle 16 extends through the needle safetydevice 44 (FIGS. 5 a to 5 d).

The distal section 116 of the second jaw 62 passes into a head sectionpart 84 which extends beyond the free end of the first jaw 55. The headsection part 84 includes an end section 118 which extends in a radialdirection towards the first jaw 55. The length of the end section 118 issuch that it covers at least a portion of the free end of the first jaw55 when the needle safety device 44 is in its collapsed state in orderto prevent the needle tip 18 from protruding out of the needle safetydevice 44 (FIGS. 5 e and 5 f).

The tension ring 50 surrounds the first and second jaws 55, 62 in theregion of their distal sections 116. The tension ring 50 is made from amaterial having elastic properties, for example rubber. The tension ring50 is configured so that the first and second jaws 55, 62 are deflectedagainst a restoring force of the tension ring 50, when the needle 16extends all the way through the needle safety device 44.

Two generally L-shaped extensions 94 are formed on opposite sides of theneedle safety device 44. The L-shaped extensions 94 emerge fromreinforced portions 120 of the first and second jaws 55, 62 in theproximal end region of the first and second jaws 55, 62. Each L-shapedextension 94 has an axial section 96 which extends in the axialdirection at a distance from the respective reinforced portion 120.

The L-shaped extensions 94 are dimensioned such that proximal endportions 98 of the proximal tube sections 34 of the introducer hub 14are tightly received between the axial sections 96 of the L-shapedextensions and the reinforced portions 120 of the needle safety device44 when the needle safety device 44 is received in the chamber 42defined by the tube sections 34, 44 of the introducer hub 14 and theneedle hub 20, as shown in FIGS. 1 a and 1 c.

Contrary to the embodiment of FIG. 4, the L-shaped extensions 94 of theneedle safety device 44 shown in FIG. 5 do not have any locking grooves100 in the inner surfaces of the axial sections 96 of the L-shapedextensions 94. Instead, the reinforced portions 120 are provided withlocking shoulders 122 for retaining the proximal tube sections 34 of theintroducer hub 14 between the axial sections 96 of the L-shapedextensions and the reinforced portions 120 of the needle safety device44. Accordingly, the proximal tube sections 34 of the introducer hub 14should be provided with corresponding locking means at their innersurfaces, for example, suitable depressions.

LIST OF REFERENCE NUMERALS

-   10 introducer sheath-   12 proximal end region-   14 introducer hub-   16 needle-   18 needle tip-   20 needle hub-   22 elongate cap-   24 distal section-   26 proximal section-   28 funnel-like structure-   30 wing-   32 distal tube section-   34 proximal tube section-   36 tear line-   38 main body-   40 tube section-   42 chamber-   44 needle safety device-   46 main part-   48 clip-   50 tension ring-   52 base portion-   54 elongate portion-   55 first jaw-   56 bore-   58 groove-   60 flat side-   62 second jaw-   64 base section-   66 deflectable section-   68 axial section part-   70 radial section part-   74 guide-   76 pin-   78 opening-   80 straight section part-   82 wing-   84 head section part-   86 free leg-   90 end face-   92 enlargement-   94 L-shaped extension-   96 axial section-   98 proximal end portion-   100 locking groove-   102 locking protrusion-   104 tube-like portion-   106 locking groove-   108 locking protrusion-   110 elongate portion-   112 elongate portion-   114 proximal section-   116 distal section-   118 end section-   120 reinforced portion-   122 locking shoulder

1. A catheter introducer comprising: a tube-like introducer sheath (10);an introducer hub (14) having a distal section (24) and a proximalsection (26), wherein the distal section (24) is joined to theintroducer sheath (10) and the proximal section (26) defines a chamber(42); a needle (16) extending through the introducer hub (14) and theintroducer sheath (10) and having opposite proximal and distal ends,wherein the distal end forms a needle tip (18); a needle hub (20)attached to the proximal end of the needle (16); and a needle safetydevice (44) slidably arranged on the needle (16), wherein the needlesafety device (44) is retained in the chamber (42) of the introducer hub(14) when the needle (16) extends through the introducer hub (14) andthe introducer sheath (10), and removable from the introducer hub (14)once the needle tip (18) is received in the needle safety device (44)upon withdrawal of the needle (16) from the introducer sheath (10).
 2. Acatheter introducer in accordance with claim 1, characterized in thatseen in a radial direction, a part of the needle safety device (44) isarranged between the introducer hub (14) and the needle hub (20).
 3. Acatheter introducer in accordance with claim 1, characterized in thatthe needle safety device (44) comprises two generally L-shapedextensions formed on opposite sides of the needle safety device (44),preferably in the region of a proximal end thereof.
 4. A catheterintroducer in accordance with claim 3, characterized in that eachL-shaped extension (94) has an axial section (96) extending generally inan axial direction at a distance from a base portion (52) or areinforced jaw portion (120) of the needle safety device (44).
 5. Acatheter introducer in accordance with claim 4, characterized in thatthe proximal section (26) of the introducer hub (14) is configured to bereceived between the axial sections (96) and the base portion (52) orthe reinforced jaw portions (120) of the needle safety device (44).
 6. Acatheter introducer in accordance with claim 5, characterized in thatlocking means (100, 102; 122) are provided to hold the proximal section(26) of the introducer hub (14) in place between the axial sections (96)and the base portion (52) or the reinforced jaw portions (120) of theneedle safety device (44), wherein, preferably, the locking means (100,102; 122) comprise a locking protrusion on the respective one part and acorresponding locking depression in the respective other part.
 7. Acatheter introducer in accordance with claim 1, characterized in thatthe proximal section (26) of the introducer hub (14) is formed from twoopposite tube sections (34) extending in an axial direction.
 8. Acatheter introducer in accordance with claim 1, characterized in thatthe needle hub (20) comprises a main body (38) and two opposite tubesections (40) extending in an axial direction from a distal end of themain body (38).
 9. A catheter introducer in accordance with claim 1,characterized in that the proximal section (26) of the introducer hub(14) is formed from two opposite tube sections (34) extending in anaxial direction and the needle hub (20) comprises a main body (38) andtwo opposite tube sections (40) extending in an axial direction from adistal end of the main body (38), wherein the tube sections (40) of theneedle hub (20) are configured to engage between the tube sections (34)of the introducer hub (14) such that the tube sections (34) of theintroducer hub (14) and the tube sections (40) of the needle hub (20)form a substantially closed tube.
 10. A catheter introducer inaccordance with claim 1, characterized in that a main body (38) of theneedle hub (20) comprises a tube-like portion (104) configured toreceive both a base portion (52) of the needle safety device (44) and aportion of the proximal section (26) of the introducer hub (14).
 11. Acatheter introducer in accordance with claim 10, characterized in thatlocking means (106, 108) are provided to hold the portion of theproximal section (26) of the introducer hub (14) in place in thetube-like portion (104) of the needle hub (20).
 12. A catheterintroducer in accordance with claim 11, characterized in that thelocking means (100, 102, 106, 108; 122) comprise a locking protrusion onthe respective one part and a corresponding locking depression in therespective other part.
 13. A catheter introducer in accordance withclaim 1, characterized in that the needle safety device (44) comprisesfirst and second jaws (55, 62) extending from the base portion (52) in agenerally axial direction.
 14. A catheter introducer in accordance withclaim 13, characterized in that the first jaw (55) is integrally formedwith the base portion (52) and, preferably, substantially rigid.
 15. Acatheter introducer in accordance with claim 13, characterized in thatthe second jaw (62) is includes a strip of material having spring-likeproperties, e.g. a strip of sheet metal or plastic.
 16. A catheterintroducer in accordance with claim 13, characterized in that the firstjaw (55) and the second jaw (62) are integrally formed with the baseportion (52), wherein preferably both jaws (55, 62) have spring-likeproperties.
 17. A catheter introducer in accordance with claim 13,characterized in that the second jaw (62) has a distal end section (86;118) which extends towards the first jaw (55) such that it sits on theneedle (16) when the needle (16) extends through the needle safetydevice (44), thereby deflecting the second jaw (62) outwardly against arestoring force, and blocks the needle tip (18) from protruding from theneedle safety device (44) when the needle tip (18) is received betweenthe jaws (55, 62).
 18. A catheter introducer in accordance with claim13, characterized in that an elastic element, in particular a tensionring (50), surrounds the first and second jaws (55, 62) in order topositively collapse the jaws (55, 62) when the needle tip (18) isreceived between the jaws (55, 62).
 19. A catheter introducer inaccordance with claim 13, characterized in that the needle (16) extendsthrough an axial bore (56) in the base portion (52) of the needle safetydevice (44), wherein the cross section of the bore (56) is adapted tothe main profile of the needle (16), and the needle (16) has anenlargement (92) near the needle tip rendering the outer diameter of theneedle (16), seen in at least one direction, greater than the diameterof the bore (56).
 20. A needle safety device (44) for guarding the tip(18) of a needle (16) of a medical apparatus, in particular a catheterintroducer in accordance with one of the preceding claims or anintravenous catheter apparatus, comprising: a base portion (52) and twojaws (55, 62) extending therefrom and defining an axial direction; andtwo generally L-shaped extensions (94) formed on opposite sides of theneedle safety device (44), wherein each L-shaped extension (94) has anaxial section (96) extending generally in the axial direction at adistance from the base portion (52) or from reinforced portions (122) ofthe jaws (55, 62).